class Person {
    public String name;
    public int age;

    public Person() {
    }
    public Person(String name) {
        this.name = name;
    }
    public Person(String name, int age) {
        this.name = name;
        this.age = age;
    }
    public static void main(String[] args) {
        Person person1 = new Person();
        person1.name = "zhangsan";
        person1.age = 10;
        System.out.println(person1.name);
        System.out.println(person1.age);
        System.out.println("===========================");

        Person person2 = new Person("zhangfei");
        person2.age = 10;
        System.out.println(person2.name);
        System.out.println(person2.age);
        System.out.println("===========================");

        Person person3 = new Person("lisi",9);
        System.out.println(person3.name);
        System.out.println(person3.age);
    }
}